Int.J.Curr.Microbiol.App.Sci (2014) 3(8) 185-196 ISSN: 2319-7706 Volume 3 Number 8 (2014) pp. 185-196 http://www.ijcmas.com Original Research Article Role of the Functional Food (Pomegranate-Yoghourt) as Hepatoprotective Effect on Liver Injured Rats Hala, M.F. El Din1, Sherif S. Mohamed2* and T.M. El-Messery1 1 Dairy Science &Technology Department, National Research Centre, Egypt 2 Nutrition & Food science Department, National Research Centre, Egypt *Corresponding author ABSTRACT Keywords Pomegranate juice, Yoghourt, antioxidant activity, phenolic compounds, Pomegranate juice (PJ) is commonly used in traditional medicine due to its therapeutic properties according to its high content of total phenolic content (TPC) and antioxidant activity (AA) which related to the management of many disorders. So, supplementing fresh buffalo skim milk with (PJ) with different ratios (2, 4, 6, 8, and 10%) and the textural properties, TPC and AA in the resultant fresh yoghurt during the cold storage for 12 days were evaluated. As the percentage of PJ was increased, the TPC and AA were increased, while the addition of PJ up to 6% had an adverse effect on the textural properties. The effect of pomegranate-yoghurt against hepatic injury (CC14 treatment) in rats was investigated through determination of some biochemical parameters in serum and liver in addition to the histophathological examination of liver under different treatments. Forty adult albino rats were equally divided into five groups; a negative control (C- ), CC14treated rats (C+ ) and groups that received a dietary yoghurt-PJ in 0, 4, 8% ratios. Results revealed that pomegranate-yoghurt improved the level of biomarkers scores of CC14-treated rats, and reduced the histopathological changes in liver with the elevating of PJ ratio. Consequently, administration of yoghurt supplemented with PJ is acceptable as functional food alleviates the harmful effect of CC14-induced liver injury and offers a pleasant and effective route in increasing the TPC and antioxidant intake in our daily diet. Introduction enhances the immune response which will be in turn increase resistance to immunerelated diseases (Meydani et al 2000). Yoghurt can be developed with fruit juice which can be part of a healthy diet (Aswal et al 2012), which increases the aesthetic value of the new product as a functional pigment (Ghadge et al 2008; Coïsson et al 2005). The challenge is, however, choosing the right functional nutrients and formulating a message that works. Yoghurt is a fermented dairy product, having several health benefits, so is healthier for consumption (lourens-Hattingh and Viljoen 2001). Yoghurt is beneficial to our digestive system, especially stomach and colon; it 185 Int.J.Curr.Microbiol.App.Sci (2014) 3(8) 185-196 for 10 min. and cooled to 40O C. Pomegranate juice (PJ) (pH 4.5) was added at the rate of 2, 4, 6, 8, 10% immediately after incubation with 3% starter culture (local market) to avoid the quick reducing of pH and transferred into 100 ml plastic containers, lightly sealed and incubated at 45O C until the complete curd formation, then stored at refrigerator (6±2O C) for 3, 6, 9, 12 days. Pomegranate (Punica granatum Linn) is a potential medicinal plant of family punicaceae (Heber 2011). Pomegranate juice was used as a healthful beverage (Basu and Penugonda 2009), since it is a natural rich source of polyphenols, flavonoid and other antioxidant. It could be considered as functional ingredients for its anti radical activities. It is good supplement for food and dietetics (Tomás-Barberán et al 2006; Basu and Penugonda 2009). Pharmacological properties of the juice were antiinflammatory (Adams et al 2006), anticancer (Adams et al 2010) and protection of hepatoxicity (Kaneria et al 2012) by carbon tetrachloride (Pirinccioglu et al 2012). Textural evaluation Texture profile analysis (TPA) performed on the yoghurt samples using the double corporation, Slinfold, W. Sussex, UK. From the force time curve the following parameters were evaluated by TPA according to the definitions by International Dairy Federation (1991). Therefore the aim of the study was to evaluate the textural parameters; total phenolic content and DPP-radical scavenging activity of yoghurt supplemented with pomegranate juice, also, the protective roles of pomegranate juice against the hepatoxicity induced by carbontetrachlorid for rats feeding on yoghurt supplemented with pomegranate juice. Hardness: force necessary to attain a given deformation Cohesiveness: the extant to which a material can be deformed before it rupture. Springiness: in the rate which the sample returns to its original shape when the deforming force is removed. Gumminess: Force needed to disintegrate the sample to a state ready for swallowing Chewiness: work needed to masticate the sample to state ready for swallowing Materials and Methods Preparation of pomegranate juice Fresh mature pomegranate fruits were purchased from local market at Giza. They were cleaned and cut; arils were manually separated from the peals and piths. The fruit juice was extracted using an electric juicer and then filtered through cotton mesh. Fresh juice (12.2% total solids) was stored in freezer. Total phenolic content (TPC) The total phenolic content determined by Folin-Ciocalteu Reagent according to Zheng et al (2001), and calculated as Gallic acid. Preparation of yoghurt Radical scavenging activity (RSA) Fresh skim buffalo milk was obtained from dairy department of Agriculture College, Cairo University. Milk was heated to 90O C The stable free radical DPPH is a rapid test 186 Int.J.Curr.Microbiol.App.Sci (2014) 3(8) 185-196 can provide information on the ability of a food compound contains antioxidants to act as free radical scavenger's ability or hydrogen donor's atom, according to (Xuewu et al., 2007). Forty adult (male and female) albino Speaque-Dawley rats with body weights 8090g were obtained from the Animal Home in National Research Center Egypt. Animals were kept individually in stainless steal cages, water was allowed adlib tam, and the room temp. was adjusted at 25O C. At the end the experimental period, rats were fasted overnight and in the morning blood samples were taken from each rat by open heart puncture under slight ether anesthesia, and serum was separated. The abdomen was opened and the liver was excised then washed with saline plotted between sheets of filter paper and weighed. Aspartate aminotransferase (AST), alanine aminotransferase (ALT), total and direct bilirubin, and albumin were estimated according to Reirtman and Frankel (1957); Dreper and Hadley (1990); Bartholomev and Delang (1966) respectively. Reduced glutathione (GSH) and glutathione peroxidase (GPX) according Ellman (1959), and Weiss et al (1980) respectively. Experimental Design Histopathology study Rates divided into 5 groups, 8 for each group as follow: After blood collection, all rats were rapidly sacrificed and the liver of each animal was dissected, weighted and portion of it was preserved in 10% buffered neutral formalin and paraffin embedded. Four sections (5mictons in thickness) were taken from each liver tissue, each section being at a distance at least 500 µ from the proceeding one sections were stained with haematoxylin and eosin for the histological examination according Ross et al (1989). Design of animal experiment Animals Group (1): C- fed on standard died only (according to AIN 1993) Group (2): C+ treated with CC14 , fed on the standard diet only. Group (3): y0 treated with CC14 , fed on yoghurt only. Group (3): y4 treated with CC14 , fed on yoghurt with 4% PJ. Statistical analysis Data of the textural analysis were statistically analyzed using GLM procedures of the SAS (SAS 1996). Means were separated by using Duncan s multiple rage test (Duncan 1955). Group (3): y8 treated with CC14 , fed on yoghurt with 8% PJ. Rats were administered (carbon tetrachloride, Sigma) by back subcutaneous injection (0.5 ml of 1:1 mixture of CC14 and olive oil) based on a calculated 3 ml/kg dosage for inducing liver injuries according to lee et al 2005. The yoghurt diet was 180 cc3 per kg body weight per day. The feeding period continued for 6 weeks. During the experimental period, the food consumption and body weight of the rats were followed. The values of the biochemical analysis were expressed as mean ± SD and ± SEM and statistically analyzed using one way analysis of variance (ANOVA). Student t test was used for significance. Differences were considered significant at p<0.05 according to Artimage and Berry (1987). 187 Int.J.Curr.Microbiol.App.Sci (2014) 3(8) 185-196 et al 2011; Com and Hisil 2010; Negi et al 2003; Gil et al 2000). Moreover Turfan et al (2012) reported that the antioxidative properties of pomegranate products are correlated with their polyphenolic content including tannins and anthocyannins. The rate of increase in TPC in fresh yoghurt supplemented with 4% and 8% (PJ), Table (2) was 27.7% and 103.6% respectively, while it was 19.9% and 92.8% in the same order after 3 days of storage. During cold storage the TPC gradually decreased for all samples, this may be attributed to the transformation of phenolic compounds which unstable and undergo numerous enzymatic and chemical reactions during storage as stated by (Cheynier (2005); Poncet-Legrand et al (2005); ESSafi et al (2007). Uzuner at al (2011) and Turfan et al (2012) found that anthocyanins in pomegranate lost its stability during storage and some of polyphenols formed diesters with -D-glucose. Results and Discussion Textural properties Table (1) presents the results of texture analysis performed on yoghurt supplemented with pomegranate juice (PJ) and the control sample. Data revealed that hardness of yoghurt samples was not significantly affected with increasing the concentration of (PJ) and storage periods until 6% then decreased significantly with increasing the (PJ) added (8%, 10%) and at the end of storage (12 days). This may be attributed to the moisture content of (PJ) at higher concentration which weakens the protein network resulting in a less firmness (Ahmed et al 2005). In yoghurt, the protein matrix consists of short interconnected chains; consequently the liquid phase of juice is immobilized in the interstitial spaces in the protein matrix (Shiby and Mishra 2012). Values of cohesiveness were relatively lower for yoghurt samples supplemented with (PJ) than in plain yoghurt samples, this may due to the strength of protein-protein interaction bonds in control yoghurt rather that in the mixture of milk and (PJ) which weakened this phenomena. Also, noticed the same results in springiness data. Moreover, chewiness and gumminess of the yoghurt supplemented with (PJ) were reduced significantly rather than control yoghurt (without PJ). Antioxidant activity (AA) DPPH radical scavenging activity (RSA) of yoghurt supplemented with (PJ) had higher antioxidant activity than control yoghurt (without juice) and this was directly proportional to the percentage of added juice Fig (2). This ascribed to the phenolic compounds found in pomegranate which are responsible for 92% of its AA (Seeram et al 2006 and Kulkarni et al 2004). The rate of increase in RSA by adding 4% and 8% pomegranate was 198% and 398 % respectively for fresh yoghurt samples, Table (3), while the corresponding rates after 3 days of storage was 106.5% and 321.7%. After 12 days of storage, the rate of increase in RSA for 4% and 8% concentration of pomegranate were 28.6% and 125.7% respectively. Total phenolic content (TPC): Results illustrated in Fig. (1) revealed that TPC of yoghurt fortified with (PJ) increased with increasing the concentration from 2% to 10% this ascribed to the TPC of (PJ) (3425 gallic acid mg/l). Many researchers reported that (PJ) is a very rich source of polyphenols including ellagitannins (Uzuner 188 Int.J.Curr.Microbiol.App.Sci (2014) 3(8) 185-196 Table.1 Texture analysis performed for yoghurt supplemental with pomegranate and the control sample Analysis Days 0% 2% 4% 6% 8% 10% hardness fresh 3 days 1.0 1.0 1.0 1.0 1.0 1.0 1.1 1.0 0.7 0.7 0.6 0.6 6 days 1.0 1.0 1.0 1.0 0.6 0.5 12 days 0.8 0.8 1.0 1.0 0.6 0.5 Cohesivness Spinginess Gumminess Chewiness fresh 0.82 0.416 0.488 0.404 0.339 0.513 3 days 0.846 0.424 0.496 0.399 0.343 0.516 6 days 0.813 0.419 0.437 0.438 0.429 0.506 12 days 0.641 0.435 0.492 0.589 0.468 0.431 fresh 0.649 0.469 0.495 0.515 0.499 0.583 3 days 0.647 0.469 0.492 0.582 0.514 0.524 6 days 0.67 0.448 0.655 0.561 0.504 0.534 12 days 0.682 0.601 0.642 0.669 0.552 0.532 fresh 0.82 0.416 0.586 0.515 0.237 0.308 3 days 0.846 0.424 0.595 0.399 0.24 0.309 6 days 0.813 0.419 0.568 0.482 0.258 0.253 12 days 0.852 0.479 0.541 0.589 0.281 0.216 fresh 0.532 0.195 0.29 0.265 0.118 0.179 3 days 0.544 0.199 0.293 0.232 0.123 0.162 6 days 12 days 0.544 0.581 0.188 0.288 0.372 0.347 0.27 0.512 0.13 0.155 0.135 0.115 Fig.1 Total phenolic content equivalent gallic acid (mg/l) of yoghurt samples supplemented with pomegranate and storage in refrigerator at 6±2°C 25 20 15 10 8 5 4 0 12 9 6 3 0 Fresh Total phenolic content equivalent gallic acid (mg/l 30 Days 189 Conc. Int.J.Curr.Microbiol.App.Sci (2014) 3(8) 185-196 Table.2 Percentage rate of increase in total phenolic content equivalent gallic acid (mg/l) of yoghurt samples supplemented with pomegranate and storage in refrigerator at 6±2°C Conc. of pomegranate 2 4 6 8 Fresh 14.458 24.711 95.783 103.614 3 10.843 14.880 87.952 92.771 Storage periods (days) 6 6.580 19.079 20.395 46.053 9 7.576 27.273 36.364 50.758 12 2.941 8.823 9.804 46.078 Table.3 Rate of increase in DPPH-radical scavenging activity (RSA) for yoghurt supplemented with pomegranate and storage in refrigerator at 6±2°C Conc. of pomegranate 2 4 6 8 Fresh 38.776 194.959 255.102 394.959 3 45.652 106.522 243.478 321.739 Storage periods (days) 6 9 48.780 25.641 58.536 38.462 60.976 43.590 260.976 192.308 12 17.143 28.571 48.571 125.714 Table.4 The weight gain, food intake, liver weight and antioxidant enzyme (Glutathione & Glutathione peroxidase) variables Groups CRange Mean ±SD Mean ± SE C+ Range Mean ±SD Mean ±SE Y0 Range Mean ±SD Mean ± SE Y4 Range Mean ± SD Mean ± SE Y8 Range Mean ±SD Mean ± SE Weight gain (g) Food intake (g/day) Liver weight (g) (25.00 - 49.00) 32.80±9.39 32.80 ± 4.20a (12.00- 14.00) 12.80 ±0.84 12.80 ±0.37a (5.00 - 7.60) 6.18 ±0.93 6.18 ±0.41a (25.00 31.00) 28.33 ±3.05 28.33 ±1.76a (250.00 -280.00) 265.00 ± 15.00 265.00 ± 8.66a (25.00 28.00) 26.20 ±1.30 26.20 ±0.58b (7.00 9.00) 8.20 ±0.84 8.20 ±0.37c (5.40 - 6.70) 5.80 ±0.52 5.80 ±0.23a (19.00 -27.00) 22.00 ±4.36 22.00 ±2.52a (215.00 240.00) 228.33 ±12.58 228.33 ±7.26b (26.00 32.00) 28.60 ±2.40 28.6 ±1.07ab (8.00 10.00) 9.00 ± 0.71 9.00 ± 0.32bc (5.80 - 6.60) 6.14 ±0.31 6.14 ±0.14a (23.00 34.00) 28.00 ±5.59 28.00 ±2.21a (210.00 -260.00) 236.66 ± 25.16 236.33 ±14.53ab (27.00 32.00) 29.80 ±1.92 29.80 ±0.86ab (9.00 - 11.00) 10.00 ±1.00 10.00 ±0.45b (6.00 - 6.80) 6.32 ±0.31 6.32 ±0.14a (18.00 26.00) 22.33 ±4.04 22.33 ±2.33a (220.00 -270.00) 245.00 ±25.00 245.00 ±14.43ab (28.00 36.00) 31.80 ±3.03 31.80 ±1.36ab (9.00 11.00) 10.00 ±1.00 10.00 ±0.13a (6.10 - 6.80) 6.50 ±0.29 6.50 ±0.13a (22.00- 29.00) 25.66 ± 3.51 25.66 ±2.02a (235.00 -260.00) 250.00 ±13.23 250.00 ±7.64ab abc GSH (mmol/g ) Means in each column having the same letter were not significantly different. Values with different superscript letters are significantly different at p<0.05. 190 GPx ( /mg) Int.J.Curr.Microbiol.App.Sci (2014) 3(8) 185-196 Fig.2 DPPH- radical scavenging activity (RSA) for yoghurt supplemented with pomegranate and storage in refrigerator at 6±2°C 30 % RSA 25 20 15 10 8 5 4 0 Conc. 12 9 6 3 Fresh 0 Days Table.5 Liver biomarkers (GOT, GPT, BILE total, BILE direct and Albumin) Variables AST ( /ml) ALT ( /ml) T.Bilirubin. ( /ml) D.Bilirubin ( /ml) Groups CRange (16.00 21.00) (14.00 21.00) (0.25 0.54) (0.01 0.10) Mean ± SD 18.60 ± 2.52 17.33 ± 3.51 0.37 ± 0.11 0.05 ± 0.05 Mean ± SE 18.60 ± 1.45b 17.33 ± 2.03a 0.37 ± 0.06a 0.05 ± 0.03a C+ Range (21.00 29.00) (19.00 23.00) (0.42 0.53) (0.01 0.18) Mean ± SD 25.60 ± 4.16 21.00 ± 2.00 0.48 ± 0.05 0.09 ± 0.09 Mean ± SE 25.60 ± 2.40a 21.000 ± 1.15a 0.48 ± 0.03a 0.09 ± 0.05a Y0 Range (23.00 27.00) (17.00 23.00) (0.30 0.60) (0.01 0.15) Mean ± SD 25.00 ± 2.00 20.33 ± 3.05 0.44 ± 0.15 0.06 ± 0.08 Mean ± SE 25.00 ± 1.15a 20.33 ± 1.76a 0.44 ± 0.08a 0.06 ± 0.05a Y4 Range (19.00 -26.00) (16.00 21.00) (0.24 0.70) (0.01 0.09) Mean ± SD 23.00 ± 3.61 18.33 ± 2.52 0.43 ± 0.24 0.06 ± 0.04 ab a a Mean ± SE 23.00 ± 2.08 18.33 ± 1.45 0.43 ± 0.14 0.06 ± 0.03a Y8 Range (18.00 23.00) (15.00 19.00) (0.26 0.59) (0.01 - 0.15) Mean ± SD 20.60 ± 2.52 16.66 ± 2.08 0.39 ± 0.18 0.06 ± 0.08 ab a a Mean ± SE 20.60 ± 1.45 16.66 ± 1.20 0.39 ± 0.10 0.06 ± 0.05a abc Means in each column having the same letter were not significantly different. Values with different superscript letters are significantly different at p<0.05. 191 Albumin (g/dl) (3.50 - 3.80) 3.63 ± 0.15 3.63 ± 0.09ab (3.40 3.50) 3.43 ± 0.05 3.43 ± 0.03b (3.60 3.90) 3.76 ± 0.15 3.76 ± 0.09a (3.50 - 3.80) 3.63 ± 0.15 3.63 ± 0.09ab (3.60 3.80) 3.70 ± 0.10 3.70 ± 0.06a Int.J.Curr.Microbiol.App.Sci (2014) 3(8) 185-196 However, the percentage of RSA gradually decreased during cold storage for all samples, this presumably due to the decrease stability of phenolic compounds and anthocyannin pigments during storage, this finding was agreement with Sagdic et al (2012); Mirsaeedghazi et al (2011). higher mean value (32.80± 4.2g) than other four groups, followed by Y8 group (31.80± 1.36g). Food intake values as comparable with weight gain values, showed significant elevation in groups Y4 and Y8 (10±0.45 and 10.00 ± 0.13 g/day respectively) rather than Y0 (9.00± 0.32 g/day). Also, it was noticed that liver weight was increased for groups Y4 and Y8 with mean ± SR 6.32± 0.14g and 6.5± 0.13g respectively, while it was 5.8± 0.23 for group C+. Biochemical assessments As expected, the subcutaneous injection of CC14 into rats is known to cause liver necrosis, alter various biomarkers such as increasing serum amino transferase activity and lipid peroxidation and depress the antioxidant system in the liver (Lee et al 2007). A similar action was noticed in group C+. Table (4) showed that weight gain value in negative control (C- ) had a The antioxidant enzyme glutathione in C+ group reduced to 22.33±2.33 mmol/g than C- group (28.33± 1.76 mmol/g). Moreover GPX value was significantly increased in groups feed on yoghurt supplemented with pomegranate in comparison to C+. 192 Int.J.Curr.Microbiol.App.Sci (2014) 3(8) 185-196 The effect of pomegranate on GSH level is due to its polyphenols, where, it is know to be able to modulate the transcription and expression of proteins related to the endogenous antioxidant defense by interacting with antioxidant response elements in genre promoter regions of genes encoding proteins related to oxidative injury management (Moskaug et al (2005); Myhrstad et al (2002). histopathological changes (Fig. 3, Pic. E). Changes in liver biomarkers values in Table (5) demonstrated that injection with CC14, group C+ increased blood AST, ALT, T. and D. Bilirubin and deceased Albumin, whereas groups Y4 and Y8 exhibited an ability to protect the hepatotoxicity by deceasing the level of AST, ALT and blood bilirubin as well as deceasing the blood albumin and this was parallel with the increase of pomegranate added to yoghurt in Y4 and Y8 group. Similar results were reported by Luangpirom et al (2013). Consequently, supplementing yoghurt with 8% pomegranate juice had a slight effect on its textural properties, but had a high positive effects on its total phenolic content and antioxidant properties. Moreover, the biochemical and histopathological studies evidenced a remarkable improvement of the hepatic cells. This confirm the ability of pomegranate to protect afainis hepatotoxicity (liver damage) induced by chemicals. This ascribed to presence of different bioactive compounds in pomegranate mainly polyphenols, falvonoids and anthocyannins which had antioxidant properties. 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